The blue-ringed octopus is the only octopus to have a lethal toxin that can kill humans. Read here to learn about potential ...

With a split-second muscle contraction, the greater blue-ringed octopus can change the size and color of the namesake patterns on its skin for purposes of deception, camouflage and signaling.

The blue-ringed octopus is small, but its venom is powerful enough to kill multiple humans in a short time. It delivers neurotoxins that can cause rapid paralysis, making it difficult or impossible to ...